CN113251607B - Air conditioner refrigeration control method and device, air conditioner and computer storage medium - Google Patents

Air conditioner refrigeration control method and device, air conditioner and computer storage medium Download PDF

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Publication number
CN113251607B
CN113251607B CN202110478679.5A CN202110478679A CN113251607B CN 113251607 B CN113251607 B CN 113251607B CN 202110478679 A CN202110478679 A CN 202110478679A CN 113251607 B CN113251607 B CN 113251607B
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temperature
air conditioner
valve
bypass valve
superheat degree
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CN113251607A (en
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沈庆政
代文杰
杜泽锋
请求不公布姓名
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the application provides an air conditioner refrigeration control method, an air conditioner refrigeration control device, an air conditioner and a computer storage medium; the refrigeration control method comprises the following steps: acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature; acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of a compressor of the air conditioner according to the operating temperature and the minimum allowable temperature; setting a target superheat degree of an air conditioner indoor unit according to the operation frequency; and acquiring the actual superheat degree of an inner machine of the air conditioner, and adjusting the opening degree of an inner machine valve of the air conditioner according to the actual superheat degree and the target superheat degree. The air conditioner refrigeration control method provided by the embodiment of the application considers the mutual influence among the compressor, the internal valve and the hot gas bypass valve in the control process, can adapt to the opening regulation rule of the internal valve after the frequency of the compressor is regulated, prevents the internal valve from being overheated, and provides the refrigeration control method with stable refrigeration effect under the low-temperature working condition.

Description

Air conditioner refrigeration control method and device, air conditioner and computer storage medium
Technical Field
The embodiment of the application relates to the technical field of air conditioners, in particular to a refrigeration control method, a refrigeration control device, refrigeration control equipment and a computer storage medium for an air conditioner.
Background
When the existing air conditioner refrigerates under the low-temperature working condition, because the evaporation area of the internal machine is small, if the displacement of the compressor is overlarge, the low pressure is low, and therefore the internal machine is easy to freeze. Therefore, it is often desirable to reduce the compressor frequency, but this can easily result in the compressor operating outside of the operating range, which can easily damage the compressor.
In order to solve the problem of refrigeration of an air conditioner under a low-temperature working condition, the prior art provides a hot gas bypass technology, namely, part of high-temperature gaseous refrigerant compressed by a compressor is directly mixed with condensed low-temperature liquid refrigerant into medium-temperature medium-pressure refrigerant, so that the low-pressure side pressure can be obviously improved, and the problem that an internal machine is easy to freeze is solved. However, when a high-temperature gaseous refrigerant compressed by a compressor is bypassed to a condensed low-temperature liquid refrigerant, parameters at a high-pressure part often change, especially, the operation stability of the air conditioner is significantly affected by hot gas bypass amount, the opening degree of an internal engine valve and the frequency of the compressor, and if the existing low-temperature refrigeration control method is adopted to control the bypass valve, the internal engine valve and the compressor, the internal engine is overheated or the high-pressure side pressure is located outside the operation range of the compressor.
Therefore, under the working condition of low-temperature refrigeration, the existing method for controlling the bypass valve, the internal valve and the compressor also has the technical problem of unstable operation.
Disclosure of Invention
The embodiment of the application provides an air conditioner refrigeration control method and device, an air conditioner and a computer storage medium, and aims to solve the technical problem that the existing method for controlling a bypass valve, an internal valve and a compressor is unstable in operation under the low-temperature refrigeration working condition.
In one aspect, an embodiment of the present application provides an air conditioner refrigeration control method, including:
acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of a compressor of the air conditioner according to the operating temperature and the minimum allowable temperature;
setting a target superheat degree of an air conditioner indoor unit according to the running frequency;
and acquiring the actual superheat degree of an indoor unit of the air conditioner, and adjusting the opening degree of an indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
On the other hand, the embodiment of this application still provides an air conditioner refrigeration controlling means, includes:
the minimum allowable temperature setting module is used for acquiring the external environment temperature and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
the compressor operating frequency setting module is used for acquiring the operating temperature of the high-pressure side of the air conditioner and setting the operating frequency of the compressor of the air conditioner according to the operating temperature and the minimum allowable temperature;
the target superheat degree determining module is used for setting the target superheat degree of an air conditioner indoor unit according to the running frequency;
and the indoor unit valve opening degree adjusting module is used for acquiring the actual superheat degree of an indoor unit of the air conditioner and adjusting the opening degree of the indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
On the other hand, this application embodiment still provides an air conditioner, including compressor, interior machine, outer machine, connect the bypass branch road of compressor exit end and outer machine exit end, set up in hot gas bypass valve on the bypass branch road, set up in the interior machine valve of interior machine entrance point to and
one or more processors;
a memory; and
one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the air conditioner cooling control method.
On the other hand, the embodiment of the present application further provides a computer storage medium, on which a computer program is stored, where the computer program is loaded by a processor to execute the steps in the air conditioner refrigeration control method.
The technical scheme of the embodiment of the application aims at solving the problems existing in the low-temperature refrigeration working condition and provides a refrigeration control method of an air conditioner. For the current low temperature refrigeration control method who takes different volume difference independent control compressor, interior valve and hot gas bypass valve, the mutual influence between compressor, interior valve and the hot gas bypass valve in the control process has been considered in this application, and is specific, after adjusting the compressor frequency, can adjust the aperture regulation rule of interior valve, prevents that interior valve is overheated. In addition, the influence of the external environment temperature is also considered, and all parts of the air conditioner can be guaranteed to run under the normal working state.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a scenario of refrigeration control according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a first embodiment of a refrigeration control method for an air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a second embodiment of a refrigeration control method for an air conditioner according to an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a refrigeration control method of an air conditioner according to a third embodiment of the present disclosure;
FIG. 5 is a schematic flow chart illustrating a refrigeration control method of an air conditioner according to a fourth embodiment of the present disclosure;
FIG. 6 is a schematic flow chart illustrating a refrigeration control method of an air conditioner according to a fifth embodiment of the present disclosure;
fig. 7 is a schematic flowchart of a cooling control method of an air conditioner according to a sixth embodiment of the present application;
FIG. 8 is a schematic flow chart illustrating a refrigeration control method of an air conditioner according to a seventh embodiment of the present disclosure;
FIG. 9 is a functional block diagram of a refrigeration control device of an air conditioner according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a refrigeration control device of an air conditioner in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the embodiments of the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the embodiments herein.
The embodiments of the present application provide a method and an apparatus for controlling cooling of an air conditioner, and a computer storage medium, which are described in detail below.
The refrigeration control method in the embodiment of the invention is applied to a refrigeration control device, the refrigeration control device is arranged in an air conditioner, the air conditioner comprises necessary components such as a compressor, an inner machine, an outer machine, a bypass branch connecting an outlet end of the compressor and an outlet end of the outer machine, a hot gas bypass valve arranged on the bypass branch, and an inner machine valve arranged at an inlet end of the inner machine, and is also provided with one or more processors, a memory and one or more application programs, wherein the one or more application programs are stored in the memory and are configured to be executed by the processor to realize the refrigeration control method.
As shown in fig. 1, fig. 1 is a schematic view of a refrigeration control scenario according to an embodiment of the present application, which may also be understood as an internal structure diagram of an air conditioner, and the refrigeration control scenario according to the embodiment of the present invention mainly includes a compressor 101, an internal unit 102, an external unit 103, a bypass branch 104 connecting an outlet end of the compressor and an outlet end of the external unit, a hot gas bypass valve 105 disposed on the bypass branch 104, an internal valve 106 disposed at an inlet end of the internal unit 102, and a plurality of temperature sensors, for example, a first temperature sensor 111 disposed on the external unit for collecting an external environment temperature, a second temperature sensor 112 disposed at an outlet end of the compressor of the air conditioner for collecting a high-pressure side temperature of the air conditioner, a third temperature sensor 113 disposed at an intersection of the bypass branch 104 and the outlet end of the external unit 103 for collecting a mixed refrigerant temperature, a fourth temperature sensor 114 disposed at an inlet pipe temperature of the internal unit of the air conditioner for collecting an inlet pipe temperature of the internal unit of the air conditioner, a fifth temperature sensor 115 disposed at the outlet end of the internal unit of the air conditioner for collecting an outlet pipe of the air conditioner, and a refrigeration control device 116. It should be noted that fig. 1 only shows a schematic operation diagram of the air conditioner in the cooling condition, and does not show a complete air conditioner, for example, the air conditioner may also be provided with a four-way valve for switching the cooling and heating conditions, and a gas-liquid separator for separating the gas phase and the liquid phase, but the invention of the present invention is not so limited, and thus fig. 1 does not show the above structural units in detail.
The refrigeration control device 116 in the embodiment of the present invention may be understood as a central processing chip of an air conditioner, and is used for processing acquired data and completing control over components of the air conditioner, and is mainly used for: acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature; acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of a compressor of the air conditioner according to the operating temperature and the minimum allowable temperature; setting a target superheat degree of an air conditioner indoor unit according to the running frequency; and acquiring the actual superheat degree of an indoor unit of the air conditioner, and adjusting the opening degree of an indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
It should be noted that the scene schematic diagram of the refrigeration control shown in fig. 1 is only an example, and the scene of the refrigeration control described in the embodiment of the present invention is for more clearly explaining the technical solution of the embodiment of the present invention, and does not constitute a limitation on the technical solution provided in the embodiment of the present invention.
Based on the scene of the refrigeration control, an embodiment of the refrigeration control method is provided.
As shown in fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a refrigeration control method of an air conditioner in the embodiment of the present application.
In the embodiment of the present application, a refrigeration control method for an air conditioner is provided, which mainly involves adjusting the operating frequency of a compressor and the opening of an internal valve, and it should be noted that, in a general case, after a hot gas bypass, a parameter of the air conditioner may suddenly change, and therefore, the operating frequency of the compressor and the opening of the internal valve need to be correspondingly adjusted to control the parameter within a reasonable and safe operating range, that is, the refrigeration control method for an air conditioner shown in fig. 2 is an adjustment method for the operating frequency of the compressor and the opening of the internal valve provided after the hot gas bypass, and when the hot gas bypass is not opened, the operating frequency of the compressor and the opening of the internal valve need not to be adjusted, specifically, the refrigeration control method for an air conditioner provided by the present application includes steps 201 to 204:
and 201, acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature.
In the embodiment of the present application, the external ambient temperature refers to an ambient temperature at which an air conditioner external unit is located. In conjunction with the above description of fig. 1, the first temperature sensor 111 disposed on the outdoor unit is generally used for collecting the data, but may be disposed at other feasible locations. In addition, for the air conditioner with the networking function, the external environment temperature can also be obtained through networking. The specific implementation modes for acquiring the external temperature are various, the specific implementation mode for acquiring the external environment temperature is not limited, and all implementation schemes for acquiring the external environment temperature can be understood to be within the protection scope of the present application.
In the embodiment of the present application, the allowable operating temperature range of the high-pressure side of the air conditioner is often different for different external environment temperatures, and therefore, the minimum allowable temperature of the high-pressure side of the air conditioner needs to be set according to the external environment temperature to prevent the air conditioner from operating in an abnormal condition.
In the embodiment of the application, the relation between the external environment temperature and the allowable operation temperature range of the high-pressure side of the air conditioner is researched based on historical test data, and the setting of the minimum allowable temperature is preferably realized by setting the external environment temperature threshold value according to the research result and the easy implementation of the scheme. Specifically, the temperature of minus 5 ℃ is used as the threshold value of the external environment temperature, and when the external environment temperature is less than minus 5 ℃, the temperature of 15 ℃ is selected as the minimum allowable temperature T of the high-pressure side of the air conditioner X When the external environment temperature is more than or equal to minus 5 ℃, the temperature of 20 ℃ is selected as the minimum allowable temperature T of the high-pressure side of the air conditioner X . The set minimum allowable temperature has a better realization effect, and the running stability of the air conditioner under the low-temperature refrigeration working condition can be ensured.
And 202, acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of the compressor of the air conditioner according to the operating temperature and the minimum allowable temperature.
In the embodiment of the application, after the hot gas bypass valve is opened, the high-pressure side parameters are often directly influenced due to the fact that a part of refrigerant is bypassed, and the operating temperature of the high-pressure side of the air conditioner is reduced along with the increase of the opening degree of the hot gas bypass valve under the normal condition. In order to ensure that the operating temperature of the high-pressure side of the air conditioner can be always within the safe operating range under the condition of different opening degrees of the hot gas bypass valve, the operating frequency of the compressor of the air conditioner can be adjusted according to the difference value between the operating temperature of the high-pressure side of the air conditioner collected in real time and the minimum allowable temperature determined in the step 201, and the aim of maintaining the operating temperature of the high-pressure side of the air conditioner within the safe operating range is achieved by adjusting the frequency of the compressor. The specific control rule may refer to the following fig. 6 and the explanation thereof.
In the embodiment of the present application, when all the indoor units are driven to normally operate in the multi-split air conditioning system, the operating frequency of the compressor at this time may be referred to as a full-load frequency of the compressor, which is usually a fixed value, and a ratio of the operating frequency of the compressor to the full-load frequency is the distribution capacity of the compressor. That is, the operating frequency of an air conditioner compressor may generally be expressed in terms of distribution capacity. In consideration of the fact that the compressor models of different air conditioners are different, the full load frequencies are different, and therefore the standards of the operating frequencies are different, in the embodiment of the application, the distribution capacity is adopted as a unified standard of control, and for a specific compressor, the operating frequency is calculated based on the full load frequency of the specific compressor after the distribution capacity is determined.
And 203, setting a target superheat degree of the indoor unit of the air conditioner according to the running frequency.
In the embodiment of the application, after hot gas is bypassed, a refrigerant in front of an internal valve is usually in a medium-pressure medium-temperature state, the state of the refrigerant is affected by the difference of the opening of the hot gas bypass valve and the operation frequency of a compressor, and if an internal valve opening adjusting method in an original state is kept, the problem of serious overheating is easily caused on the internal valve, so that a control method for adjusting the opening of the internal valve is needed. Specifically, the target superheat degree of the indoor unit of the air conditioner is set according to different running frequencies. When the operating frequency is low, the tolerance for the degree of superheat is high, and the target degree of superheat is generally set to a large value, whereas when the operating frequency is high, the tolerance for the degree of superheat is low, and the target degree of superheat is generally set to a small value.
In the embodiment of the application, the relation between the operating frequency and the tolerable degree of superheat is researched based on historical test data, and the target degree of superheat is preferably set by setting the threshold of the operating frequency in combination with the research result and the easiness in implementation of the scheme. Since the foregoing step 202 indicates that the allocation capability is used as a uniform criterion instead of the actual operating frequency. Specifically, with a dispensing capacity of 20% as a threshold, when the current dispensing capacity is less than 20%, the tolerance for the degree of superheat is high, and may be set to 2 ℃, and when the current dispensing capacity is higher than 20%, the tolerance for the degree of superheat is low, and is typically set to 1 ℃. Under the control condition, the internal machine can be well maintained in a relatively stable running state.
And 204, acquiring the actual superheat degree of the air conditioner indoor unit, and adjusting the opening degree of the air conditioner indoor unit valve according to the actual superheat degree and the target superheat degree.
In the embodiment of the present application, the superheat degree of the indoor unit can be understood as the difference value between the temperature at the outlet end of the indoor unit and the temperature at the inlet end of the indoor unit, and with reference to the content of fig. 1, the temperature at the outlet end of the indoor unit is generally acquired by the fifth temperature sensor 115 disposed at the outlet end of the indoor unit of the air conditioner, and the temperature at the inlet end of the indoor unit is generally acquired by the fourth temperature sensor 114 disposed at the inlet end of the indoor unit of the air conditioner, and the temperature at the outlet section of the indoor unit is set to be T out Setting the inlet section temperature of the internal machine to be T in If the actual degree of superheat is X = T out -T in 。
It should be noted that, for the multi-split air conditioner, that is, the multi-indoor unit, when there is a part of the indoor units working and a part of the indoor units do not work, the inlet end temperature of the indoor unit refers to an average value of the inlet end temperatures of the indoor units in the working state, and similarly, the outlet end temperature of the indoor unit refers to an average value of the outlet end temperatures of the indoor units in the working state.
In the embodiment of the application, the opening degree of the indoor unit valve in the air conditioner is adjusted according to the difference value between the actual superheat degree and the target superheat degree, so that the superheat degree of the indoor unit of the air conditioner is always maintained near the target superheat degree, a certain tolerance, namely a buffer value, is reserved, and the phenomenon of sudden overheating of the indoor unit caused by the adjustment of the opening degree of the hot gas bypass valve and the operation frequency of the compressor is prevented. The rule for adjusting the opening of the internal combustion engine valve is specifically described with reference to fig. 7 and the explanation thereof.
The technical scheme of the embodiment of the application aims at solving the problem existing in the low-temperature refrigeration working condition and provides the refrigeration control method of the air conditioner. For taking different volume independent control compressor, interior machine valve and the current low temperature refrigeration control method of hot gas bypass valve respectively, the mutual influence between compressor, interior machine valve and the hot gas bypass valve in the control process has been considered in this application, and is specific, after adjusting the compressor frequency, can adjust the aperture regulation rule of interior machine valve, prevents that interior machine valve is overheated. In addition, the influence of the external environment temperature is also considered, and all parts of the air conditioner can be guaranteed to run under the normal working state.
As shown in fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the refrigeration control method of the air conditioner in the embodiment of the present application.
In some embodiments of the present application, before obtaining the outside ambient temperature and setting the minimum allowable temperature of the high pressure side of the air conditioner according to the outside ambient temperature, a control process for the hot gas bypass valve is further included, and specifically, the control process includes steps 301 to 303:
301, acquiring the actual inlet pipe temperature of the air conditioner indoor unit, the actual superheat degree of the air conditioner indoor unit and the operating temperature of the high-pressure side of the air conditioner.
In the embodiment of the application, the actual inlet pipe temperature T of the air conditioner indoor unit in The actual superheat degree X of the indoor unit of the air conditioner is determined by the actual inlet pipe temperature and the actual outlet pipe temperature of the indoor unit of the air conditioner, which can be specifically referred to the explanation of the foregoing step 204, and the operating temperature T of the high-pressure side of the air conditioner is acquired by the fourth temperature sensor 114 arranged at the inlet end of the indoor unit of the air conditioner 2 The second temperature sensor 112 is disposed on the outlet end of the compressor of the air conditioner, and it should be noted that the high-pressure side of the air conditioner belongs to the common general knowledge in the art, and generally refers to the temperature from the outlet end of the compressor to the inlet end of the internal valve, and those skilled in the art can also select the temperature from the outlet end of the compressor to any point on the inlet end of the internal valve as the high-pressure side of the air conditionerSide operating temperature. In this application, the temperature at the outlet end of the compressor is collected as the operating temperature on the high pressure side of the air conditioner.
And 302, judging whether to control to open a hot gas bypass valve according to the acquired current actual pipe inlet temperature, the actual superheat degree and the operating temperature. If the control opens the hot gas bypass valve, step 302 is executed; if the control is not needed to open the hot gas bypass valve, other steps are executed.
In this application embodiment, when adopting the refrigeration operating mode under low temperature environment, often can lead to the internal unit to freeze because of the low pressure is on the low side, and at this moment, the actual pipe temperature of going into of internal unit, the actual superheat degree of internal unit and the operating temperature of high-pressure side often can be outside the normal operating range, consequently, can go into pipe temperature, actual superheat degree and operating temperature through the reality and judge whether start the steam bypass valve. Specifically, the actual pipe inlet temperature T can be judged by combining historical test data in And determining whether to start the hot-gas bypass valve or not by judging whether the temperature is less than-2 ℃, whether the actual superheat degree of the internal machine is less than 1 ℃ or not and whether the running temperature of the high-pressure side is higher than 10 ℃, and judging that the hot-gas bypass valve needs to be started when one of the conditions is met for 3 minutes or the accumulated reaching times exceeds 10 times. Otherwise, the hot gas bypass valve does not need to be started when the air conditioner is in a normal refrigeration state.
In the embodiment of the present application, in addition to using the above conditions as the conditions for determining to open the hot gas bypass valve, it is obvious that the air conditioner is required to be in a cooling condition. And when the air conditioner is in other working conditions, the hot gas bypass valve cannot be opened, and when the air conditioner is in a special stage, such as defrosting or oil return stage, the hot gas bypass valve cannot be opened.
303, obtaining the external environment temperature, setting the initial opening of the bypass valve according to the external environment temperature, and adjusting the hot gas bypass valve to the initial opening of the bypass valve.
In the embodiment of the application, when the bypass valve needs to be opened according to judgment, the initial opening degree of the bypass valve can be determined through the acquired external environment temperature, so that the parameters of the system are restored to the normal operation range as soon as possible, and the opening degree of the bypass valve is further adjusted continuously in the follow-up process to maintain the normal inlet pipe temperature of the internal machine.
In the embodiment of the present application, it can be understood that when the outside ambient temperature is low, the initial opening degree of the hot gas bypass valve should be large, and when the outside ambient temperature is high, the initial opening degree of the hot gas bypass valve may be relatively low. Specifically, similar to the previous step 201, in combination with the historical test data, the temperature of-5 ℃ is also used as the threshold value of the external environment temperature, when the external environment temperature is less than-5 ℃, the initial opening of the hot gas bypass valve is set to 50, i.e., 50% open, and when the external environment temperature is greater than or equal to-5 ℃, the initial opening of the hot gas bypass valve is set to 30, i.e., 30% open.
Referring to fig. 4, fig. 4 is a schematic flow chart of a refrigeration control method of an air conditioner according to a third embodiment of the present invention.
In some embodiments of the present application, after the hot gas bypass valve is adjusted to the initial opening degree, the opening degree of the hot gas bypass valve needs to be further adjusted according to the system data collected in real time, which includes steps 401 to 403:
401, if the obtained current actual inlet pipe temperature of the air conditioner internal unit is not equal to a preset target inlet pipe temperature, calculating an inlet pipe temperature difference value between the current actual inlet pipe temperature and the target inlet pipe temperature.
In the embodiment of the present application, the initial opening of the hot gas bypass valve is set to recover the system parameters to the normal operating range as soon as possible, and after the system is opened for a period of time, the hot gas bypass valve needs to be further adjusted. Specifically, the current actual inlet pipe temperature of the air conditioner internal unit is continuously obtained, and whether the current actual inlet pipe temperature is equal to the preset target inlet pipe temperature or not is judged. In combination with historical test data, in general, in order to ensure the system temperature operation as much as possible, the preset target inlet pipe temperature is set to 0 ℃, that is, the inlet pipe temperature of the internal machine is maintained at a stable 0 ℃ as much as possible by adjusting the hot gas bypass valve, although a person skilled in the art can also select a suitable target inlet pipe temperature based on actual requirements.
Obviously, it can be understood that when the actual pipe entering temperature is not equal to the target pipe entering temperature, the opening degree of the hot gas bypass valve needs to be adjusted, and when the actual pipe entering temperature is equal to or considered to be equal to the target pipe entering temperature, the opening degree of the hot gas bypass valve is temporarily maintained unchanged until the next adjustment process. It should be noted that the adjustment of the opening of the hot gas bypass valve, including the subsequent adjustment of the operating frequency of the compressor and the opening of the internal engine valve, belongs to a periodic adjustment process, that is, even if the collected data is satisfactory, the current state is only temporarily maintained and no adjustment is made, and the adjustment process is not terminated.
And 402, determining a bypass valve opening adjusting step length corresponding to the inlet pipe temperature difference according to the difference and a bypass valve adjusting mapping table.
For convenience of description, the inlet pipe temperature difference between the actual inlet pipe temperature and the target inlet pipe temperature is understood as a value obtained by subtracting the inlet pipe temperature from the target inlet pipe temperature, and it is also considered that the bypass valve opening adjustment step length is positive or negative, that is, when the bypass valve opening adjustment step length is negative, the hot gas bypass valve opening is adjusted in a negative direction, that is, the opening of the hot gas bypass valve is reduced. At this time, there is a positive correlation between the difference and the adjustment step, that is, if the difference is positive, the bypass valve opening should be increased, the adjustment step of the bypass valve opening is also positive, and if the difference is greater, the adjustment step of the bypass valve opening should be greater, and if the difference is negative, that is, if the value obtained by subtracting the pipe inlet temperature from the target pipe inlet temperature is negative, that is, if the pipe inlet temperature is higher than the target pipe inlet temperature, the bypass valve opening should be decreased, and the adjustment step of the bypass valve opening is also negative. The mapping table of the difference and the bypass valve adjustment may be understood as a data table containing a mapping relationship between the inlet pipe temperature difference and the bypass valve opening adjustment step length, specifically, if a positive correlation coefficient between the step length and the difference is 1, the bypass valve opening adjustment step length Px = T tar -T in Wherein T is tar Namely the set target inlet pipe temperature.
And 403, adjusting the opening of the hot gas bypass valve according to the opening adjusting step length of the bypass valve.
In the embodiment of the present application, it can be known from the foregoing description 402 that when the bypass valve opening adjustment step Px is smaller than 0, the opening of the hot gas bypass valve should be correspondingly decreased.
In the embodiment of the present application, in combination with the historical test data, the adjustment cycle of the hot gas bypass valve is preferably 40 s/time, that is, steps 401 to 403 are executed every 40s to adjust the opening degree of the hot gas bypass valve.
Referring to fig. 5, fig. 5 is a schematic flow chart of a fourth embodiment of the refrigeration control method of the air conditioner in the embodiment of the present application.
In some embodiments of the present application, it is considered that the refrigerant before entering the internal machine for throttling is in a medium-pressure and medium-temperature state after the hot gas bypass valve is opened, so that the opening degree of the internal machine valve needs to be adjusted to prevent the internal machine from serious overheating, during adjustment, the internal machine valve needs to be adjusted to an initial opening degree to buffer the refrigerant change suddenly caused by hot gas bypass, and then the opening degree of the hot gas bypass valve is adjusted according to the system data acquired in real time, wherein the adjustment of the initial opening degree of the internal machine valve includes steps 501-502:
501, the temperature of the mixed refrigerant at the intersection of the bypass branch and the outlet end of the outdoor unit is obtained.
In the embodiment of the present application, referring to fig. 1, the temperature of the mixed refrigerant at the intersection of the bypass branch and the outlet end of the outdoor unit 103 is collected by the third temperature sensor 113 disposed at the intersection of the bypass branch 104 and the outlet end of the outdoor unit 103, and is specifically T f And (4) showing.
It should be emphasized that the present embodiment proposes to perform an initial adjustment of the internal valve immediately after the hot gas bypass valve is opened, in order to buffer the influence of the sudden refrigerant change caused by the opening of the hot gas bypass.
502, setting the initial opening of the internal valve according to the obtained difference value between the current actual pipe inlet temperature and the mixed refrigerant temperature of the internal unit of the air conditioner, and adjusting the internal valve in the air conditioner to the initial opening of the internal valve.
In the embodiment of the present application, the difference from the hot gas bypass valve is that under normal operating conditions, the hot gas bypass valve is in a closed state, whereas the internal engine valve needs to be in an open state. In conjunction with the historical test data, the initial opening Px' = Po +2 (T) of the internal valve f -T in ) And Po is the opening degree of the internal engine valve before the hot gas bypass valve is opened.
In the embodiment of the present application, it should be noted that the adjustment of the internal valve to the initial opening degree is performed before the step of adjusting the frequency of the compressor, that is, before the step 201.
Referring to fig. 6, fig. 6 is a schematic flow chart of a fifth embodiment of a refrigeration control method of an air conditioner in the embodiment of the present application.
In some embodiments of the present application, a step of adjusting an operating frequency of a compressor of an air conditioner is provided, which specifically includes steps 601 to 603:
601, obtaining the operating temperature of the high-pressure side of the air conditioner, and judging whether the operating temperature is less than the minimum allowable temperature. If the operating temperature is less than the minimum allowable temperature, executing steps 602 to 603; if the operating temperature is not less than the minimum allowable temperature, other steps are performed.
In the embodiment of the application, the stable and normal operation of the system requires that the operation temperature of the high-pressure side of the air conditioner is within the normal operation temperature range, and because the minimum allowable temperature, namely the minimum allowable operation temperature, is determined according to the external environment temperature, the operation temperature of the high-pressure side of the air conditioner needs to be controlled not to be less than the minimum allowable temperature, otherwise, the high-pressure side of the air conditioner cannot be stably and normally operated. That is, at this time, it may be determined whether the currently acquired operating temperature is less than the minimum allowable temperature, and if not, it indicates that the high-pressure side of the air conditioner is operating normally, that is, the operating frequency of the air conditioner compressor does not need to be adjusted. If the temperature is lower than the minimum allowable temperature, the high-pressure side of the air conditioner is in an abnormal operation state, and therefore, the high-pressure side of the air conditioner needs to be in a normal operation state by adjusting the operation frequency of the compressor of the air conditioner.
And 602, acquiring the operating frequency of the air conditioner compressor, and determining a correction coefficient corresponding to the operating frequency according to a frequency and coefficient mapping table.
In the embodiment of the present invention, it can be known from the foregoing that, since the frequencies of different air conditioner compressors are different, in order to facilitate the unified standard, the operating frequency is represented by using the ratio of the frequency of the air conditioner compressor to the full load frequency, that is, the allocation capacity of the air conditioner compressor is obtained, and then the allocation capacity is corrected, and the operating frequency is obtained by combining the full load frequency again.
In the embodiment of the present application, the frequency-to-coefficient mapping table may be understood as a data table containing a mapping relationship between the operating frequency of the compressor and the correction coefficient. Specifically, in combination with historical test data, when the current capacity Q of the compressor of the air conditioner is assigned 0 When the current distribution capacity Q of the compressor of the air conditioner is less than 20%, the set correction coefficient U is 0.3 0 When the current distribution capacity is greater than or equal to 20% and less than 50%, the set correction coefficient U is 0.2, and when the current distribution capacity Q of the compressor of the air conditioner is 0 If the current distribution capacity is higher than or equal to 50%, the set correction coefficient U is 0.1, that is, the smaller the current distribution capacity is, the larger the corrected amplitude coefficient is, that is, the larger the amplitude of each adjustment is, and the higher the current distribution capacity is, the smaller the corrected amplitude coefficient is, that is, the smaller the amplitude of each adjustment is.
603, calculating the ratio of the minimum allowable temperature and the operation temperature, and adjusting the operation frequency of the air conditioner compressor according to the ratio and the correction coefficient.
In the embodiment of the present invention, the amplitude of the distribution capacity adjustment is obviously related to the difference between the minimum allowable temperature and the operating temperature, besides the current distribution capacity, and the larger the difference is, the larger the distribution capacity difference is, the amplitude of the distribution capacity can be increased appropriately, specifically, the formula for correcting the distribution capacity is as follows: q 1 ＝Q 0 ×(T X /T 2 ) X (1 +U), wherein Q 1 To adjust backend distribution capabilities.
In the embodiment of the invention, the relationship between the compressor operating frequency and the distribution capacity is uniquely determined at a given full load frequency, i.e. the present solution, although proposing to adjust the distribution capacity, is essentially intended to adjust the compressor operating frequency.
In the embodiment of the present invention, in combination with the historical test data, the adjustment period of the operating frequency of the air conditioner compressor is preferably 3 min/time, that is, steps 601 to 603 are performed every 3min to adjust the operating frequency of the air conditioner compressor.
Referring to fig. 7, fig. 7 is a flowchart illustrating a cooling control method of an air conditioner according to a sixth embodiment of the present invention.
In some embodiments of the present application, a step of adjusting an opening degree of an internal valve in an air conditioner is provided, which specifically includes steps 701 to 703:
701, acquiring an actual superheat degree of an air conditioner indoor unit.
In the embodiment of the present application, it can be understood that the adjustment of the opening of the internal machine valve is mainly used for preventing the air conditioner from overheating, that is, the actual overheating degree of the internal machine of the air conditioner is obtained, and whether the actual overheating degree is equal to the target overheating degree related to the operation frequency of the compressor is judged. Similarly, the adjustment of the opening degree of the internal valve is also performed periodically, so that even if the actual superheat degree is equal to the target superheat degree, the current opening degree of the internal valve is only temporarily maintained, instead of terminating the adjustment of the opening degree of the internal valve, and if the actual superheat degree is not equal to the target superheat degree, the actual superheat degree needs to be brought close to the target superheat degree by adjusting the opening degree of the internal valve.
And 702, calculating a superheat difference value between the actual superheat degree and the target superheat degree, and determining an inner valve opening adjusting step length corresponding to the superheat difference value according to the difference value and an inner valve adjusting mapping table.
In the embodiment of the present application, specifically, if the difference between the degrees of superheat is greater than 0, that is, the actual degree of superheat is greater than the target degree of superheat, the opening of the internal valve should be increased, and otherwise, if the difference between the degrees of superheat is less than 0, that is, the actual degree of superheat is less than the target degree of superheat, the opening of the internal valve should be decreased. Specifically, in combination with the historical test data, if the superheat difference is greater than 0, the opening of the internal valve needs to be increased by an opening of 5 pls/step, and if the superheat difference is less than 0, the opening of the internal valve can be decreased by an opening of 5 pls/step.
703, adjusting the opening degree of the internal valve according to the opening degree adjusting step length of the internal valve.
In the embodiment of the application, the adjustment of the opening of the inner valve is adjusted in real time, namely, the opening of the inner valve is adjusted in real time according to the superheat degree detected in real time and the target superheat degree. And when the actual superheat degree is larger than the target superheat degree, continuously increasing the opening degree of the internal valve by the amplitude of 5 pls/step until the detected superheat degree is smaller than the target superheat degree, and switching to continuously decreasing the opening degree of the internal valve by the amplitude of 5 pls/step.
Referring to fig. 8, fig. 8 is a schematic flow chart of a seventh embodiment of the refrigeration control method of the air conditioner in the embodiment of the present application.
In some embodiments of the present application, a large amount of relevant data, such as a relationship between an external environment temperature and a minimum allowable temperature, and a relationship between an operating frequency and a target superheat degree, may be analyzed based on historical test data, and based on the relationship, the relationship may be used for guidance of a subsequent air conditioner refrigeration control method, specifically, before acquiring the external environment temperature and setting the minimum allowable temperature of a high pressure side of the air conditioner according to the external environment temperature, steps 801 to 805 are included:
at 801, test operating temperatures of the high pressure side of the air conditioner at a plurality of different ambient test temperatures are obtained.
In the embodiment of the application, the scheme provided by the invention is mainly used for controlling the air conditioner under the low-temperature refrigeration working condition, so that the adopted test temperatures of different external environments are all in the low-temperature environment, namely the test data under the normal external environment temperature are not considered.
And 802, determining a median temperature in the test operation temperatures, and determining an external environment test temperature corresponding to the median temperature as an external environment temperature threshold.
In the embodiment of the application, the median temperature of the obtained test operation temperature is determined, and the external environment test temperature corresponding to the median temperature is used as the external environment temperature threshold.
And 803, calculating an average value of the test operating temperatures of the high pressure side of the air conditioner at the outside environment test temperature higher than the outside environment temperature threshold value, and setting the average value as the first minimum allowable temperature.
In the embodiment of the present application, the test operating temperature of the high pressure side of the air conditioner at the outside environment test temperature higher than the outside environment temperature threshold is counted, and then the average value is calculated and set as the first minimum allowable temperature.
And 804, calculating the average value of the test operation temperature of the high-pressure side of the air conditioner at the external environment test temperature lower than the external environment temperature threshold value, and setting the average value as a second minimum allowable temperature.
In the present embodiment, contrary to step 803, the test operating temperature of the high-pressure side of the air conditioner at the outside environment test temperature lower than the outside environment temperature threshold is counted, and then the average value is calculated and set as the second minimum allowable temperature.
805, constructing a corresponding relationship between the ambient temperature and the minimum allowable temperature according to the ambient temperature threshold, the first minimum allowable temperature value and the second minimum allowable temperature.
In the embodiment of the present invention, at this time, a corresponding relationship may be constructed according to the external environment temperature threshold, the first minimum allowable temperature value, and the second minimum allowable temperature value, that is, when the external environment temperature is higher than the external environment temperature threshold, the first minimum allowable temperature value is set as the minimum allowable temperature, and when the external environment temperature is lower than the external environment temperature threshold, the second minimum allowable temperature value is set as the minimum allowable temperature. Specifically, the external environment temperature threshold value provided by the scheme is-5 ℃, the first minimum allowable temperature value is 20 ℃, and the second minimum allowable temperature value is 15 ℃.
It should be noted that the operation parameters may be different for different air conditioners, and the results obtained based on the historical test data are different. Even if the specific rules are different, the corresponding relationship between the external environment temperature and the minimum allowable temperature determined based on the similar manner should be regarded as the protection scope of the present invention. Besides, except that the ambient temperature and the minimum allowable temperature of the high-pressure side of the air conditioner can be obtained by adopting the manner of the steps 801 to 805, other corresponding relations mentioned in the invention can also be obtained by similar schemes, such as the corresponding relation between the operating frequency and the target superheat degree.
In order to facilitate understanding of the complete refrigeration control method provided by the invention, the following concrete steps are adopted:
when any condition that the inlet pipe temperature of the indoor unit is less than-2 ℃, the superheat degree of the indoor unit is less than or equal to 1 ℃ and the high-pressure side operating temperature is higher than 10 ℃ is met, the indoor unit is continuously used for 3 minutes or the accumulated times in the period reach 10 times, if the collected external environment temperature is lower than-5 ℃, the minimum allowable temperature T is set X Setting the temperature at 15 deg.C, setting the hot gas bypass valve at 50% opening, and setting the minimum allowable temperature T if the collected external environment temperature is not lower than-5 deg.C X At 20 c and the hot gas bypass valve was set to 30% open. After the hot gas bypass valve is opened, the temperature T of the mixed refrigerant is collected f And inlet pipe temperature T of air conditioner indoor unit in And according to the current opening Po of the internal valve and the temperature T of the mixed refrigerant f And temperature T of pipe entering in Adjusts the opening degree of the internal valve to an initial opening degree Px ', wherein Px' = Po +2 (T) f -T in ). After the initial adjustment of the hot gas bypass valve and the internal valve is completed, the subsequent adjustment of the opening of the hot gas bypass valve, the running frequency of the compressor and the opening of the internal valve is synchronously performed. Wherein:
1) Adjusting the opening of the hot gas bypass valve in a period of 40s, calculating the difference value between the preset target pipe inlet temperature and the actual pipe inlet temperature during each adjustment, and adjusting the opening of the hot gas bypass valve according to the difference value;
2) Adjusting the frequency of the compressor in a period of 3min, and judging the operating temperature T of the high-pressure side of the air conditioner during each adjustment 2 Whether it is less than the set minimum allowable temperature T X If the current distribution capacity is smaller than the preset value, the current distribution capacity Q of the compressor is determined 0 Determining corresponding correction coefficient U, and then according to the minimum allowanceAllowable temperature T X And operating temperature T 2 Difference and current allocation capability Q 0 Calculating the corrected distribution capacity Q by the correction coefficient U 1 Wherein Q is 1 ＝Q 0 ×(T X /T 2 )×(1+U)；
3) Determining a target superheat degree according to the current running frequency of the compressor, acquiring the actual superheat degree of an air conditioner indoor unit in real time, increasing the opening degree of the indoor unit valve by the amplitude of 5 pls/step if the actual superheat degree is larger than the target superheat degree, and decreasing the opening degree of the indoor unit valve by the amplitude of 5 pls/step if the actual superheat degree is smaller than the target superheat degree.
As shown in fig. 9, fig. 9 is a schematic diagram of functional modules of a refrigeration control device of an air conditioner in an embodiment of the present application.
In order to better implement the refrigeration control method in the embodiment of the present application, on the basis of the refrigeration control method, the embodiment of the present application further provides a refrigeration control device, where the refrigeration control device includes:
a minimum allowable temperature setting module 901, configured to obtain an external environment temperature, and set a minimum allowable temperature of a high-pressure side of the air conditioner according to the external environment temperature;
the compressor operating frequency setting module 902 is configured to obtain an operating temperature of a high-pressure side of the air conditioner, and set an operating frequency of a compressor of the air conditioner according to the operating temperature and the minimum allowable temperature;
a target superheat degree determining module 903, configured to set a target superheat degree of an air conditioner indoor unit according to the operation frequency;
and the indoor unit valve opening degree adjusting module 904 is used for acquiring the actual superheat degree of the indoor unit of the air conditioner and adjusting the opening degree of the indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
In some embodiments of the present application, before the obtaining the outside environment temperature and setting the minimum allowable temperature of the high pressure side of the air conditioner according to the outside environment temperature, the method includes:
acquiring the actual pipe inlet temperature of an air conditioner indoor unit, the actual superheat degree of the air conditioner indoor unit and the operating temperature of the high-pressure side of the air conditioner, and judging to open a hot gas bypass valve according to the actual pipe inlet temperature, the actual superheat degree and the operating temperature;
and if the hot gas bypass valve is opened, acquiring the external environment temperature, setting the initial opening degree of the bypass valve according to the external environment temperature, and adjusting the hot gas bypass valve to the initial opening degree of the bypass valve.
In some embodiments of the present application, after the adjusting the hot gas bypass valve to the bypass valve initial opening degree, the method further comprises:
acquiring the actual pipe inlet temperature of an air conditioner internal unit, and judging whether the actual pipe inlet temperature is equal to the target pipe inlet temperature or not;
if the actual pipe inlet temperature is not equal to the target pipe inlet temperature, calculating a pipe inlet temperature difference value between the actual pipe inlet temperature and the target pipe inlet temperature, and determining a corresponding bypass valve opening adjusting step length according to a corresponding relation between the difference value and the opening adjusting step length and the pipe inlet temperature difference value;
and adjusting the opening of the hot gas bypass valve according to the opening adjusting step length of the bypass valve.
In some embodiments of the present application, after the adjusting the hot gas bypass valve to the initial opening degree of the bypass valve, the method further includes:
acquiring the temperature of a mixed refrigerant at the intersection of the bypass branch and the outlet end of the outer machine and the inlet pipe temperature of the inner machine of the air conditioner;
and setting the initial opening of the internal valve according to the mixed refrigerant temperature and the pipe inlet temperature, and adjusting the internal valve in the air conditioner to the initial opening of the internal valve.
In some embodiments of the present application, the compressor operation frequency setting module 902 includes:
acquiring the operating temperature of the high-pressure side of the air conditioner, and judging whether the operating temperature is less than the minimum allowable temperature or not;
if the operating temperature is lower than the minimum allowable temperature, acquiring the operating frequency of the air conditioner compressor, and determining a corresponding correction coefficient according to the operating frequency and the corresponding relationship between the frequency and the coefficient;
and calculating the difference value between the minimum allowable temperature and the operating temperature, and adjusting the operating frequency of the compressor of the air conditioner according to the difference value and the correction coefficient.
In some embodiments of the present application, the inner engine valve opening adjustment module 904 includes:
acquiring an actual superheat degree of an air conditioner indoor unit, and judging whether the actual superheat degree is equal to the target superheat degree or not;
if the actual superheat degree is not equal to the target superheat degree, calculating a superheat degree difference value of the actual superheat degree and the target superheat degree, and determining a corresponding inner valve opening adjusting step length according to a corresponding relation between the difference value and an inner valve adjusting step length and the superheat degree difference value;
and adjusting the opening of the internal valve according to the opening adjusting step length of the internal valve.
In some embodiments of the present application, before the obtaining the outside environment temperature and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the outside environment temperature, the method further includes:
acquiring test operating temperatures of the high-pressure side of the air conditioner at a plurality of different external environment test temperatures, and calculating an average value of the test operating temperatures;
determining a median temperature in the test operation temperatures, and determining an external environment test temperature corresponding to the median temperature as an external environment temperature threshold;
calculating the average value of the test operation temperature of the high-pressure side of the air conditioner at the external environment test temperature higher than the external environment temperature threshold value, and setting the average value as a first minimum allowable temperature;
calculating the average value of the test operation temperature of the high-pressure side of the air conditioner at the external environment test temperature lower than the external environment temperature threshold value, and setting the average value as a second minimum allowable temperature;
constructing a corresponding relation between the external environment temperature and the minimum allowable temperature according to the external environment temperature threshold, the first minimum allowable temperature value and the second minimum allowable temperature;
the setting of the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature comprises the following steps:
and setting a corresponding minimum allowable temperature according to the external environment temperature and the corresponding relation.
The technical scheme of this application embodiment provides an air conditioner refrigeration controlling means to the problem that low temperature refrigeration operating mode exists. For taking different volume independent control compressor, interior machine valve and the current low temperature refrigeration controlling means of steam bypass valve respectively, the mutual influence between compressor, interior machine valve and the steam bypass valve in the control process has been considered in this application, and is specific, after adjusting the compressor frequency, can adjust the aperture regulation rule of interior machine valve, prevents that interior machine valve is overheated. In addition, the influence of the external environment temperature is also considered, and all parts of the air conditioner can be guaranteed to run under the normal working state.
As shown in fig. 10, fig. 10 is a schematic structural diagram of a refrigeration control device of an air conditioner in an embodiment of the present application.
In an embodiment of the present application, the refrigeration control apparatus includes:
one or more processors;
a memory; and
one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to perform the steps of the refrigeration control method described in any of the above-described embodiments of the refrigeration control method.
Specifically, the method comprises the following steps: the refrigeration control apparatus may include components such as a processor 1001 of one or more processing cores, memory 1002 of one or more computer storage media, a power source 1003, and an input unit 1004. Those skilled in the art will appreciate that the refrigeration control arrangement illustrated in fig. 10 does not constitute a limitation of the refrigeration control arrangement, and may include more or fewer components than those illustrated, or some components in combination, or a different arrangement of components. Wherein:
the processor 1001 is a control center of the refrigeration control apparatus, connects various parts of the entire refrigeration control apparatus by various interfaces and lines, and executes various functions and processes data of the refrigeration control apparatus by running or executing software programs and/or modules stored in the memory 1002 and calling data stored in the memory 1002, thereby performing overall monitoring of the refrigeration control apparatus. Optionally, processor 1001 may include one or more processing cores; preferably, the processor 1001 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1001.
The memory 1002 may be used to store software programs and modules, and the processor 1001 executes various functional applications and data processing by operating the software programs and modules stored in the memory 1002. The memory 1002 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data created according to the use of the refrigeration control apparatus, and the like. Further, the memory 1002 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 1002 may also include a memory controller to provide the processor 1001 access to the memory 1002.
The refrigeration control device further includes a power source 1003 for supplying power to each component, and preferably, the power source 1003 may be logically connected to the processor 1001 through a power management system, so that functions of managing charging, discharging, power consumption, and the like are realized through the power management system. The power source 1003 may also include any component including one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.
The refrigeration control apparatus may further include an input unit 1004, and the input unit 1004 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
Although not shown, the refrigeration control apparatus may further include a display unit and the like, which will not be described in detail herein. Specifically, in this embodiment, the processor 1001 in the refrigeration control apparatus loads an executable file corresponding to a process of one or more application programs into the memory 1002 according to the following instructions, and the processor 1001 runs the application programs stored in the memory 1002, thereby implementing various functions as follows:
acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of a compressor of the air conditioner according to the operating temperature and the minimum allowable temperature;
setting a target superheat degree of an air conditioner indoor unit according to the running frequency;
and acquiring the actual superheat degree of an indoor unit of the air conditioner, and adjusting the opening degree of an indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer storage medium and loaded and executed by a processor.
To this end, an embodiment of the present invention provides a computer storage medium, which may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like. Stored thereon, is a computer program, which is loaded by a processor to perform the steps of any one of the refrigeration control methods provided by the embodiments of the present invention. For example, the computer program may be loaded by a processor to perform the steps of:
acquiring the external environment temperature, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
acquiring the operating temperature of the high-pressure side of the air conditioner, and setting the operating frequency of the compressor of the air conditioner according to the operating temperature and the minimum allowable temperature;
setting a target superheat degree of an air conditioner indoor unit according to the running frequency;
and acquiring the actual superheat degree of an indoor unit of the air conditioner, and adjusting the opening degree of an indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.
The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
The refrigeration control method provided in the embodiment of the present application is described in detail above, and the principle and the embodiment of the present invention are explained in detail herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present invention.

Claims (9)

1. A refrigeration control method of an air conditioner is characterized by comprising the following steps:
acquiring the actual pipe inlet temperature of an air conditioner indoor unit, the actual superheat degree of the air conditioner indoor unit and the operating temperature of the high-pressure side of the air conditioner;
judging whether to control to open a hot gas bypass valve according to the acquired current actual pipe inlet temperature, the actual superheat degree and the operating temperature; the hot gas bypass valve is arranged on a bypass branch connecting the outlet end of the compressor and the outlet end of the outer machine;
if the hot gas bypass valve is controlled to be opened, acquiring the external environment temperature, setting the initial opening degree of the bypass valve according to the external environment temperature, and adjusting the hot gas bypass valve to the initial opening degree of the bypass valve;
setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
setting the operating frequency of an air conditioner compressor according to the operating temperature and the minimum allowable temperature;
setting a target superheat degree of an air conditioner indoor unit according to the running frequency;
and adjusting the opening degree of an internal valve in the air conditioner according to the actual superheat degree and the target superheat degree.
2. The air conditioner refrigeration control method as recited in claim 1 further comprising, after said adjusting said hot gas bypass valve to said bypass valve initial opening, the steps of:
if the obtained current actual pipe inlet temperature of the indoor unit of the air conditioner is not equal to the preset target pipe inlet temperature, calculating a pipe inlet temperature difference value between the current actual pipe inlet temperature and the target pipe inlet temperature;
determining a bypass valve opening adjusting step length corresponding to the inlet pipe temperature difference according to the difference and a bypass valve adjusting mapping table;
and adjusting the opening of the hot gas bypass valve according to the opening adjusting step length of the bypass valve.
3. The air conditioner refrigeration control method as recited in claim 1 further comprising, after said adjusting said hot gas bypass valve to said bypass valve initial opening, the steps of:
acquiring the temperature of a mixed refrigerant at the intersection of the bypass branch and the outlet end of the outdoor unit;
and setting the initial opening of the internal valve of the air conditioner according to the obtained difference value between the current actual pipe inlet temperature and the mixed refrigerant temperature of the internal machine of the air conditioner, and adjusting the internal valve of the air conditioner to the initial opening of the internal valve.
4. The air conditioner refrigeration control method as claimed in claim 1, wherein said setting an operating frequency of an air conditioner compressor based on said operating temperature and said minimum allowable temperature comprises:
judging whether the operating temperature is lower than the minimum allowable temperature or not;
if the operating temperature is lower than the minimum allowable temperature, acquiring the operating frequency of the air conditioner compressor, and determining a correction coefficient corresponding to the operating frequency according to a frequency and coefficient mapping table;
and calculating the ratio of the minimum allowable temperature to the operating temperature, and adjusting the operating frequency of the air conditioner compressor according to the ratio and the correction coefficient.
5. A refrigeration control method of an air conditioner according to claim 1, wherein said adjusting the opening degree of a valve in the air conditioner based on said actual superheat degree and said target superheat degree comprises:
if the actual superheat degree is not equal to the target superheat degree, calculating a superheat degree difference value of the actual superheat degree and the target superheat degree, and determining an indoor valve opening degree adjusting step length corresponding to the superheat degree difference value according to the difference value and an indoor valve adjusting mapping table;
and adjusting the opening of the internal machine valve according to the opening adjusting step length of the internal machine valve.
6. The air conditioner refrigeration control method as claimed in claim 1, further comprising, before said obtaining an outside ambient temperature and setting a minimum allowable temperature of a high pressure side of an air conditioner according to the outside ambient temperature:
acquiring test operating temperatures of the high-pressure side of the air conditioner at a plurality of different external environment test temperatures;
determining a median temperature in the test operation temperatures, and determining an external environment test temperature corresponding to the median temperature as an external environment temperature threshold;
calculating the average value of the test operation temperature of the high-pressure side of the air conditioner at the external environment test temperature higher than the external environment temperature threshold value, and setting the average value as a first minimum allowable temperature;
calculating the average value of the test operation temperature of the high-pressure side of the air conditioner at the external environment test temperature lower than the external environment temperature threshold value, and setting the average value as a second minimum allowable temperature;
constructing a corresponding relation between the external environment temperature and the minimum allowable temperature according to the external environment temperature threshold, the first minimum allowable temperature value and the second minimum allowable temperature;
the setting of the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature comprises the following steps:
and setting a minimum allowable temperature according to the external environment temperature and the corresponding relation.
7. An air conditioner refrigeration control device, characterized by comprising:
the minimum allowable temperature setting module is used for acquiring the actual pipe inlet temperature of the air conditioner indoor unit, the actual superheat degree of the air conditioner indoor unit and the operating temperature of the high-pressure side of the air conditioner;
judging whether to control to open a hot gas bypass valve according to the acquired current actual pipe inlet temperature, the actual superheat degree and the operating temperature; the hot gas bypass valve is arranged on a bypass branch connecting the outlet end of the compressor and the outlet end of the outer machine;
if the hot gas bypass valve is controlled to be opened, setting the initial opening degree of the bypass valve according to the external environment temperature, adjusting the hot gas bypass valve to the initial opening degree of the bypass valve, and setting the minimum allowable temperature of the high-pressure side of the air conditioner according to the external environment temperature;
the compressor running frequency setting module is used for setting the running frequency of the compressor of the air conditioner according to the running temperature and the minimum allowable temperature;
the target superheat degree determining module is used for setting a target superheat degree of an air conditioner indoor unit according to the running frequency;
and the indoor unit valve opening degree adjusting module is used for adjusting the opening degree of an indoor unit valve in the air conditioner according to the actual superheat degree and the target superheat degree.
8. An air conditioner is characterized by comprising a compressor, an inner machine, an outer machine, a bypass branch connecting the outlet end of the compressor and the outlet end of the outer machine, a hot gas bypass valve arranged on the bypass branch, an inner machine valve arranged at the inlet end of the inner machine, and
one or more processors;
a memory; and
one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the air conditioner refrigeration control method of any one of claims 1 to 6.
9. A computer storage medium, characterized in that a computer program is stored thereon, which is loaded by a processor to perform the steps in the air conditioner cooling control method according to any one of claims 1 to 6.
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